The term 'border line' can be defined as a line that marks the BOUNDARY between two areas. It can also refer to the EDGE of a country or region. The three crossword solutions for this term are HEM (3 letters), EDGE (4 letters), and BOUNDARY (8 letters). HEM is a term used to describe the EDGE of a garment, such as a shirt or dress. EDGE is a word used to describe the outermost part of something, such as the EDGE of a cliff or the EDGE of a table. BOUNDARY is a word used to describe the limit or extent of an area, such as the BOUNDARY of a state or the BOUNDARY of a property. All three words can be used to describe the border line between two areas.